ADLINK CoreExpress-ECO2 - Manual (Page 32)

4.26 Get Main Current
This command reads 4 values representing the last 4 currents drawn by the board. The values are
sampled every 250ms. The order of the 4 values is NOT in relationship to the time. The access to the
SMC may increase the drawn current of the whole system. In this case, you still have 3 samples
without the influence of the read access.
The returned values must be calculated by the user application into a current. Please look at the
board technical manual chapter “LEMT functions” for the equation to calculate the returned value
into a current.
START SMC_addr ACK command ACK START (Repeat) SMC_addr+1 ACK
length ACK(C) MSB_byte1 ACK(C) LSB_byte1 ACK(C) ... MSB_byte4 ACK(C)
LSB_byte4 ACK(C) STOP
Table 4.26.1 SMC transmitter format of the Get Main Current Command Code
ITEM DESCRIPTION
START SM-bus start condition
SMC_addr 0x50 (8-bit)
ACK SM-bus acknowledge condition generated by receiver
command 0x69 = “Get Main Current” Command code
length 0x08 = 8 Bytes data length
MSB byte n
LSB byte n
4 samples of 16-Bit data value of Main Current (n=1..4)
STOP SM-bus stop condition
Table 4.26.2 Explanation of Table 4.26.1